サクリファイスボディー～古代迷宮に封じられた禁断の肉体改造秘術～

It was known as The Grave, an ancient labyrinth in which a
forbidden art was sealed. Seeking treasure and fame many adventurers entered, never to return.
What happened to them?

Long thought defeated, a trio of heroines have been collected by a mysterious figure called the Grave Keeper in a stony prison deep inside labyrinth: Sharqua the female Knight of Prauha Kingdom, Birgitta the Believer of Sophia, and Catelina "Catcha" the Summoner...